There are a few ways you can help out.
Published material certainly has typos and awkward sentences. Somethings may be unclear. If you find errors or have suggestions, you can contact me via email, chat, or by opening a GitLab issue.
If you're a doctor, paramedic, nurse, or other highly qualified medical provider, you can always review things against modern best practices. I know I'm not an expert and am more than willing to make changes.
At the time it was published, the wish list of illustrations was incomplete. If you want to add illustrations for the next revision, get in touch.
Since I started writing Riot Medicine, people have asked for translations. Some have volunteered to translate as well. I am attempting to coordinate this via Matrix chat. You can coorindate on your own, or you can join the group chats to connect with others.